Budapesti Muszaki Egyetem

Magyar Tudomanyos Akademia

Radelkis Elektrokemiai Muszergyarto Szovetkezet

Peti Nitrogenmuvek

Richter Gedeon Vegyeszeti Gyar Rt

Egyt Gyogyszervegyeszeti Gyar

Labor Muszeripari Muvek

Magyar Tudomanyos Akademia Kutatas- Es Szervezetelemzo Intezete

Elektrokemial Muszergyarto Szov.

Novenyolajipari Es Mososzergyarto Vallalat

Radelkis Elektrokemiai Miszergyarto Szovetkezet

Magyar Tudomanyos Akademia Kozponti Hivatals

Erno Pungor

Jeno Havas

Geza Takacsi Nagy

Klara Toth

Zsofia Feher

Sandor Gal

Laszlo Toke

Istvan Bitter

Margit Szeiler Nee Nemeth

Jozsef Barlai

Gyorgy Horvai

Emma Porjesz

Klara Szepesvary Nee Toth

Geza Siposs

Erno Lindner

Elek Doktor

Bela Eross

Bela Gai

Marton Patko

Adorjan Monostory

Jozsef Nagy

Jozsef Petro

Lajos Kecskes

Janisz Sztatisz

Jozsef Gulyas

Janos Hollo

Jeno Zolnay

Ferenc Rakias

Istvan Bokor

Maria Horvath

Klara S Toth

Laszlo Bihatsi

Veronika, Nee Karpati

Bela Eros

Ferenc Pal

Maria Forro Nee Horvath

Peter Sarkany

Maria Varadi

Eva Kurucz

Jozsef Tarcali

Jozsef Barics

Lajos Kollar

Laszlo Zolna

Balazs Juhasz

Piroska Lukacs

Lajos Fodor

Electrode arrangement with liquid-metal electrode of controllable surface, comprising a liquid-metal reservoir, a capillary connected thereto through a controllable valve and contact means being in electric contact with the liquid-metal in the capillary. According to the invention at least one section of the capillary is formed within a metal body not reacting chemically with the liquid-metal, said metal body constituting the contact means. Preferably, the metal body is formed so that an elastic closing element of the valve fits to a surface of the metal body surrounding an opening of the capillary section formed therein.

Electrode arrangement with liquid-metal electrode of controllable surface

The invention relates to new crown ether derivatives of the general Formula I ##STR1## and a process for the preparation thereof wherein Z.sup.1 is a group of the general Formula ##STR2## R.sub.a and R.sub.b may be the same or different and R.sub.a represents an alkyl group having 1-4 carbon atoms and R.sub.b is an alkyl group having 1-20 carbon atoms. The new crown ethers are useful in the preparation of ion-selective electrodes having a long lifetime.

New crown ether derivatives, process for the preparation thereof and

Method and an apparatus for performing routine analyses such as

The invention relates to a capacitive measuring element intended for continuous measurements of conductance in streaming solutions. The essence of the measuring element is that in the measuring space the surfaces limiting it are covered by an electrically insulating material. A method for obtaining the dimensions of the measuring element has also been proposed. According to the measuring element of the invention the measurements of concentration from very low values with high accuracy and low noise level are possible. The life duration and the reliability of the measuring element are high, and it shows a high resistivity against corrosive media to be measured.

Capacitive measuring element for oscillometric measurement of

Crown ether compounds, process for the preparation of the crown ether

A molecule selective sensor having two permeable membranes in contacting relationship with each other, one membrane being a protein membrane found in nature, as for example, hog intestine membrane, air bladder of fish, epidermal section of mammals and reptiles, etc. and the other membrane being the reaction product of acrylamide, polyvinylalcohol, an enzyme, bovine albumin and glutaric aldehyde.

Molecule selective sensor for industrial use and procedure for its

A molecule selective sensor has an enzymatically active membrane which is prepared by reacting an enzyme with glutaric aldehyde on the surface of a protein membrane found in nature. Exemplary is the reaction of glucoseoxidase with glutaric aldehyde on the surface of hog intestine membrane.

Molecule selective enzyme electrode

The invention relates to a new process for the preparation of highly accurate and stable silver-silver salt reference electrode. According to the invention a homogeneous mixture is formed from silver powder and a powdered silver salt, then a paste is prepared by blending the mixture with a liquid binding agent capable of adhering to metals, applying the paste onto the surface of an electrode base, allowing the paste to harden and then subjecting the electrode to a heat treatment between 100.degree. C. and 250.degree. C. In this latter step a porous silver-silver salt layer is formed on the metal base, which renders the electrode highly accurate and stable. Ion selective measuring electrodes are prepared essentially in the same manner with the difference that silver is replaced partly or entirely by graphit.

Process for the preparation of highly accurate and stable electrode

A process is disclosed for the production of a urea-fatty acid adduct composed of discrete solid particles and having high protein and starch equivalent values wherein an aqueous solution or melt of urea at increased temperature is reacted with a fatty acid or a mixture of fatty acid and neutral fat at an increased temperature in a weight ratio of urea to fatty acid between 40 : 60 and 60 : 40 in a confined reacting space for about 2.5 to 10 seconds and wherein the mixture has been sprayed into a spraying space to allow the particles to crystallize in the air stream from the spraying.

Process and apparatus for producing a urea fatty acid adduct consisting

The invention relates to a process of and equipment for a selective, quick and accurate analysis of liquid samples. According to the process of the invention a liquid or a gas sample absorbed by a liquid is allowed to flow at a constant volume rate and overtitrated with an amount of a reagent adequate to the measurement in a definite time. Then the flow of the reagent is decreased to zero in a definite time, meanwhile continuously following, in a known way, the changes occurring in the reaction mixture. The determination of the concentration is carried out by comparing the time elapsed between the appearances of the two chemical equivalence points with calibration curves prepared with standard solutions, said time having a well defined functional relationship with the concentration of the sample. The equipment according to the invention for carryinng out the process according to the invention contains an analysis channel in contact with a sample-storage tank or liquid storage tank or sampling device or liquid feeding device, said analysis channel comprising a gas-permeable membrane contacting a sample gas before the titration section if desired, said analysis channel being equipped with a pump, said analysis channel having a titration section comprising a small-volume flowthrough homogenizing space and a reagent feeder or reagent generator device coupled to a programming unit and joining said channel before the said homogenizing space. For the measurement and recording of changes occurring in time, said analysis channel has, in its section between said homogenizing space and the suitably shaped effluent section, a detector section containing one or more detectors and a recording and/or indicator unit; if desired, said analysis channel has an electronic signal processing unit coupled to the recording and/or indicator unit and to the programming unit. The accuracy of analyses carried out by the process and equipment according to the invention is identical with or higher than that of automatic titrators, and its velocity is identical with that of measurements carried out by flowthrough analysis channels, combining in this way all the advantages of both methods and measuring instruments.

Process of and equipment for the analysis of liquid samples by titration

Highly sensitive, selective halide and sulfide-sensitive electrodes featuring a sensing block of spherical surface and laminar design compensating for the effect of thermal dilatation and the absence of a liquid junction.

Selective halide and sulfide sensitive electrodes

A process and apparatus for the voltammetric measurement of sample component quantities is disclosed wherein the material to be measured is passed by means of a pulsating-delivery pump into a voltammetric cell by way of a flow cross-section restriction to the surface of the voltammetric electrode, the liquid jet being adjusted such that its cross-section in the vicinity of the measuring surface of the electrode should be greater than the measurement area of the latter. The obtained voltammetric current curve is integrated at the area below the peak value, the current changing as a function of the pulsating flow rate of the liquid and the material quantities are determined from the integrated data. Preferably, the integration is effected from a value corresponding to 50% of the maximum flow rate to the maximum value and from there again down to 50% of the flow rate maximum.

Process and apparatus for the voltammetric measurement of the quantity

A process for recovering reusable suspended metal catalyst with a pre-determined minimum particle size from a suspension of metal particles in a liquid phase by subjecting the suspension to a continuously moving magnetic field of a minimum intensity.

Process for recovering suspended metal catalyst from their suspension

A selective fluoride-sensitive electrode featuring a sensor block of spherical surface compensating the effect of thermodilatation and prepared from the fluorides of a lanthanide mixture corresponding to the composition of the natural occurrents or from a mixture composed of the majority of lanthanides.

Selective fluoride-sensitive electrode

The invention relates to a continuous process for the preparation of Raney catalysts with controlled particle size, wherein the alloy of the catalytically active metal formed with aluminium and/or zinc is subjected to alkaline leaching, the hydrogen gas formed in this leaching step is separated and removed, the obtained product is washed, and the obtained catalyst with the desired particle size is separated. The improvement in this process comprises leaching the aluminium and/or zinc component of the alloy in a medium constantly kept in a turbulent flow, and removing the solid particles smaller than the desired range during the washing of the catalyst. The invention relates further to an apparatus for carrying out the above process, comprising a reaction chamber 1 made of one or more reactor(s) and equipped with feeding inlets 2, 3, and 4, a separator 6 equipped with a gas removing outlet 7, a tubing connecting said reaction chamber 1 to said separator 6, a washing-separating-sorting unit 9 equipped with one or more washing liquid introducing inlet(s) 10 and washing liquid removing outlet(s) 11, a tubing 8 connecting said separator 6 to said washing-separating-sorting unit 9, a storing unit 12, and a tubing 13 connecting said washing-separating-sorting unit 9 to said storing unit 12. According to the invention Raney catalysts with controlled particle size and constant characteristics can be prepared in a continuous operation.

Process for the continuous production of Raney catalysts

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Budapest, Hungary

Erno Pungor